Yii 2.0 UML Diagrams?

I think than some UML Diagraman can be useful for a more soft and ease understanding of the design of the framework for develop and update of future and actual extentions, and other stuff. What did you think?

i use UML every day, in combination with Yii. I think UML must not be a part of Yii itself,but if some of us is aimed to build a Yii module for UML layer that (as an example) generates thecode from a sequence diagram back and forward, then it would be nice, for Yii 1.1 and 2.0...or as a a backward tool that profiles the full action sequence into a Uml diagram would be nice too.